Effects of genetic variations in the dystonia protein torsinA: identification of polymorphism at residue 216 as protein modifier.

Abstract:

:Four naturally occurring sequence variations have been found in the coding region of the DYT1 gene encoding torsinA. One of these, a 3 bp (DeltaGAG) deletion, underlies dominantly inherited cases of early-onset torsion dystonia. Others, including a single nucleotide polymorphism that replaces aspartic acid (D) at residue 216 with histidine (H) in 12% of normal alleles and two other rare deletions, have not been clearly associated with disease. To gain insight into how these sequence variations affect torsinA, we used the structure of the related protein ClpB to provide a model of torsinA's AAA+ domain. Motifs important for ATP hydrolysis-sensor 1 and sensor 2-were identified, mutagenized and used to validate predictions of this model. Inspection revealed that the DeltaGAG deletion associated with dystonia removes one residue from an alpha-helix in the C-terminal portion of the AAA+ domain. The resulting distortion in torsinA structure may underlie this mutant's known tendency to produce ER-derived inclusions as well as its proposed loss of function. The D/H polymorphism at residue 216 falls in the N-terminal portion of the AAA+ domain near the sensor 1 motif. Surprisingly, cells expressing torsinA with the polymorphic histidine developed inclusions similar to those associated with DeltaGAG-torsinA, indicating that this change may also affect torsinA structure. Introducing H216 into DeltaGAG-torsinA reduced its tendency to form inclusions, suggesting that the two changes offset each other. Our findings point to a structural basis for the defects associated with the disease-linked DeltaGAG deletion in torsinA. They also suggest possible connections between the allelic polymorphism at residue 216 and the penetrance of DYT1 dystonia, as well as a possible role for this polymorphism in related disease states.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Kock N,Naismith TV,Boston HE,Ozelius LJ,Corey DP,Breakefield XO,Hanson PI

doi

10.1093/hmg/ddl055

subject

Has Abstract

pub_date

2006-04-15 00:00:00

pages

1355-64

issue

8

eissn

0964-6906

issn

1460-2083

pii

ddl055

journal_volume

15

pub_type

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